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Index: package/lib/stub/relay/AdaptiveCache.php
===================================================================
--- package/lib/stub/relay/AdaptiveCache.php
+++ package/lib/stub/relay/AdaptiveCache.php
@@ -0,0 +1,119 @@
+<?php
+
+namespace Relay;
+
+class AdaptiveCache
+{
+    /**
+     * Whether the adaptive cache is enabled for this Relay object.
+     *
+     * Since the Count-Min Sketch is shared it may exist for a given endpoint,
+     * but not be enabled for a specific Relay object. When it exists but is not
+     * enabled for a specific object the sketch counts will still be updated.
+     *
+     * @readonly
+     * @var bool
+     */
+    public bool $enabled = false;
+
+    /**
+     * The actual state of the adaptive cache. The user can request an adaptive
+     * cache of a certain width and depth, but it is not actually created until
+     * Relay attaches to an in-memory endpoint. This can fail if we are out of
+     * memory. This property will be ['inactive', 'active'].
+     *
+     * @readonly
+     * @var string
+     */
+    public string $status = 'inactive';
+
+    /**
+     * The underlying count-min sketch width.
+     *
+     * @readonly
+     * @var int
+     */
+    public int $width = 0;
+
+    /**
+     * The underlying count-min sketch depth.
+     *
+     * @readonly
+     * @var int
+     */
+    public int $depth = 0;
+
+    /**
+     * Minimum number of events before a key is cached.
+     *
+     * @readonly
+     * @var int
+     */
+    public int $minEvents = 0;
+
+    /**
+     * Minimum read/write ratio before a key is cached.
+     *
+     * @readonly
+     * @var float
+     */
+    public float $minRatio = 0.0;
+
+    /**
+     * The adaptive cache formula (`pure`, `scaled`).
+     *
+     * @readonly
+     * @var string
+     */
+    public string $formula = 'scaled';
+
+    /**
+     * @internal
+     */
+    protected function __construct() {}
+
+    /**
+     * Returns the estimated load factor.
+     *
+     * @return float|false
+     */
+    #[Attributes\Local]
+    public function loadFactor(int $depth = 1): float|false {}
+
+    /**
+     * Flush the adaptive cache.
+     *
+     * @param  bool  $async
+     * @return bool
+     */
+    #[Attributes\Local]
+    public function flush(bool $async = true): bool {}
+
+    /**
+     * Returns stats for given key name.
+     *
+     * @param  string  $key
+     * @return array|false
+     */
+    #[Attributes\Local]
+    public function stats(string $key): array|false {}
+
+    /**
+     * Increment a key's read or write counter by given count.
+     *
+     * @param  string  $key
+     * @param  bool  $write
+     * @param  int  $count
+     * @return bool
+     */
+    #[Attributes\Local]
+    public function incrBy(string $key, bool $write, int $count): bool {}
+
+    /**
+     * Get the last time the adaptive cache was flushed.
+     *
+     * @return float
+     */
+    #[Attributes\Local]
+    public function lastFlush(): float {}
+}